2938840【PDF 7/106 页】POWER SUPPLY 1A 24VDC

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Table of Contents

General ...................................................................................................................................1-1

Basics .....................................................................................................................................2-1

Mechanical Structure ......................................................................................... 2-1

2.1.1 Open Frame Devices .......................................................................... 2-2

2.1.2 Enclosed Devices ............................................................................... 2-3

Electrical Structure ............................................................................................. 2-4

Regulation Types .............................................................................................2-10

2.3.1 Unregulated Devices ........................................................................ 2-10

2.3.2 Regulated Devices ...........................................................................2-11

Converter Types............................................................................................... 2-14

2.4.1 Flyback Converter ............................................................................2-15

2.4.2 Forward Converter ............................................................................2-19

2.4.3 Push-Pull Converter .........................................................................2-23

Useful Information from Everyday Practice ............................................................................3-1

Parallel Connection ............................................................................................ 3-1

3.1.1 Parallel Connection for Increasing Power .......................................... 3-3

3.1.2 Parallel Connection for Designing Redundant Circuits ....................... 3-7

Series Connection for Increasing Voltage (48 V DC) ....................................... 3-11

Preventive Function Monitoring DC OK ...........................................................3-12

Adjustability of the Output Voltage ................................................................... 3-20

Wide-Range Input ............................................................................................3-23

Connection to Different Network Configurations ..............................................3-24

Selective Protection by Means of Fusing in the Secondary Circuit ..................3-28

Layout of External Primary-Circuit Fusing........................................................ 3-31

Layout of 24 V DC Supply Cables (Cable Cross Section)................................3-32

Rating of the AC Low Voltage Supply Line ......................................................3-34

Questions on EMC ...........................................................................................3-35

Pollution Degree............................................................................................... 3-36

Short-Term Mains Buffering .............................................................................3-37

Starting Behavior of the Power Supply Unit .....................................................3-38

Output Characteristic Curves of Power Supply Units....................................... 3-39

3.15.1 Fold-Back Characteristic ..................................................................3-40

3.15.2 U/I Characteristic .............................................................................. 3-41

3.15.3 U/I Characteristic With Power Boost ................................................3-42

Installation and Connection.............................................................................. 3-43

Emergency Stop Circuit ...................................................................................3-46

5598_en_03

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